In a normal game, Penta gains weight after he eats food (voluntarily or otherwise.) If his weight is too high, then he has to start the stage again. In "pirate" mode, a single piece of food makes him grow obese - which makes clearing the stage under the weight limit much harder.

Unused Text

The game script makes a reference to a race between Penta and Genji, the main antagonist. While there are stages where you fly a plane, you never race against anything other than the stage timer. This text is located at address 0061FA in the ROM.

Japanese

English translation

ぺ・ぺんたたすけて ぎんじにつれさらわれちゃう・・

Pe... Penta!Save me! I've beenabducted by Ginji...

こおりの むこうでぎんじがまってるわ！

Ginji's waiting foryou on the other sideof the ice!

しょうぶは・・・・ぺんたの かて！

The winner is....Penta!

しょうぶは・・・・ぎんじの かて！

The winner is....Ginji!

ぺんた 「やった―！」ぎんじ 「うえっぷ・・・」

Penta: "Yes! I did it!"Ginji: "Hmph..."

(Source: Original script translation by Tetsuo, Shih Tzu and the users of MO's board)

Unused Graphics

Penko has early graphics for walking and rejecting Penta, presumably meant for the title screen in early development.

Penta has graphics for what could be burping(?), looking down, an early kick(?), a downwards facing hurt sprite, looking at the camera (found near the HUD, possibly for a life system), and flailing his arms around (possibly for getting hurt in the final boss.)

Graphics for a tiny plane (presumably Penta's,) and a wing(?) can be found near the map graphics.

The only thing in the ROM that's related to Ginji that's unused is this map sprite, found next to Penta's.